JP7410544B2 - folding boom - Google Patents

Description

The present invention relates to a boom used as a structural material for various structures, such as space structures such as antennas of artificial satellites and probes, and solar panels, and ground structures.

As a conventional boom, the applicant has already proposed a boom as described in Patent Document 1. This boom includes a cylindrical member with a closed cross-section structure, the cylindrical member has a crease part for folding in the direction of the central axis, and is divided into a plurality of patterns by the crease part, and the cylindrical member is folded in a direction parallel to the central axis. In a stretchable structure that can take a contracted form and an extended form in which the folds are opened and expanded into a cylindrical shape, multiple patterns can be formed into a planar form and a cylindrical form while having the rigidity to maintain the shape. The curved part constituting a part of the cylindrical shape of the shaped member is made up of a hard part having elasticity that can be elastically deformed, and the fold part is made up of a flexible part that can be deformed.

Patent No. 6433006

The above-mentioned boom was a self-extending boom that could be folded and stored despite having a closed cross-section configuration and self-extending with elastic force, but it was necessary to maintain the folded form.

The present invention has been made in view of the above circumstances, and its purpose is to provide a bistable device that has self-expanding force and can stably maintain itself in two forms: a folded form and an extended form. The objective is to provide a folding boom with

In order to achieve the above object, the present invention
A folding boom having a bistable boom body that is stably held in two forms: a folded form and an extended form that extends in a uniaxial direction,
The boom body includes a plurality of units of elastic cylindrical components connected in one direction via a first hinge element,
Each cylindrical component is divided into a first elastic deformation element and a second elastic deformation element by a plane including the central axis of the boom main body in an extended state, and the first elastic deformation element and the second elastic deformation element A configuration in which the elastic deformation element is connected via a flexible second hinge element,
The first elastic deformation element is a rectangular elastic thin plate that extends linearly in the direction of extension, and has a convex surface on the opposite side from the second elastic deformation element in the direction perpendicular to the direction of extension. A first curved form that curves in an arc shape, and extends linearly in a direction orthogonal to the extension direction, and curves in an arc shape in the extension direction so that the side opposite to the second elastic deformation element has a convex surface. It is possible to stably hold the first two curved forms and the two forms;
The second elastic deformation element is a rectangular elastic thin plate that extends linearly in the extension direction, and has an arcuate shape in the direction orthogonal to the extension direction so that the opposite side to the first elastic deformation element has a convex surface. a second curved form that is curved in a straight line; It is possible to stably hold two forms: a second two curved forms that curve in the opposite direction to the elastic deformation element;
Adjacent cylindrical components are characterized in that the first elastic deformation element and the second elastic deformation element are arranged in opposite positions.
In the folded configuration, the first elastic deformation element of the cylindrical component is deformed into the first bicurved configuration, the second elastic deformation element is deformed into the second bicurved configuration, and each cylindrical component is deformed into the second bicurved configuration. The curved surface of the second elastically deformable element is overlapped with the curved surface of the first elastically deformable element so as to fit through the hinge element. As a result, the cylindrical component becomes stable in a curved form with a double structure in which the curved first elastically deformable element and the second elastically deformable element are flatly overlapped.
In this state, the end sides of the cylindrical component are straight, the first hinge element is straight, and the adjacent curved cylindrical component can be bent at the first hinge element. In the cylindrical components adjacent to each other, since the first elastic deformation element and the second elastic deformation element are located on opposite sides, the curved surfaces of the cylindrical components in the curved form alternately convex to opposite sides. By bending it in a zigzag manner via the first hinge element, the curved surfaces of the curved cylindrical component overlap each other and are stably held.
In the folded configuration, the curved configuration of each cylindrical component is stably maintained, so that the entire boom body is stably maintained in the folded configuration.
When unfolding from a folded state, for example, if one cylindrical component held in a flat curved shape is deformed into a cylindrical shape, it becomes elastically unstable and expands from the folded state to the other stable state. It begins to elastically restore itself to a certain extended configuration, the bent linearly extending connection opens, and the adjacent folded cylindrical component also begins to restore to its extended configuration, causing each cylindrical component to collapse at once. Transition to extended form.

In addition, other inventions include
A folding boom having a bistable boom body that is stably held in two forms: a folded form and an extended form that extends in a uniaxial direction,
The boom body has a configuration in which first elastic deformation elements and second elastic deformation elements are alternately connected in one direction in sequence via a flexible first hinge element,
The first elastic deformation element is a rectangular elastic thin plate, and has a first curved form that extends linearly in the extension direction and curves in an arc shape in a direction orthogonal to the extension direction; and a first two curved shapes extending in a straight line in a direction orthogonal to the first curved shape and curved in an arc shape so that the same side as the curved surface of the first curved shape is convex in the extension direction. It is possible to hold the
The second elastic deformation element is a rectangular elastic thin plate that extends linearly in the extension direction and curves in an arc shape in a direction orthogonal to the extension direction, and has a second first curved form that is curved in an arc shape in a direction perpendicular to the extension direction; and a second two curved shapes that extend linearly in a direction orthogonal to the second curved shape and curve in a direction opposite to the second first curved shape in the extension direction. It is characterized by being possible.
The present invention differs from the above-mentioned inventions in that the structural unit is not a cylindrical component with a closed cross section, but a single unit consisting of a first elastic deformation element and a second elastic deformation element, and the boom body has an open cross section structure. becomes.
In the folded configuration, the boom body is inverted in a zigzag manner via the first hinge element so that the first two curved forms of the curved surface of the adjacent first elastically deformable element and the second elastically deformable element The curved surfaces of the second two curved forms overlap and are stably held.
In the case of extension, the first elastic deformation element or the second elastic deformation element located at the end of the boom body, which is stable in the folded configuration, is placed in the first one-curved configuration and the second one-curved configuration, respectively. When transferred, the first elastic deformation element or the second elastic deformation element becomes a semi-cylindrical shape with an arcuate cross section extending in the extension direction, and the adjacent first elastic deformation element or second elastic deformation element is successively transferred. The deformation propagates and elastically deforms into a semi-cylindrical first curved form and a second one-curved form extending in the extension direction, and the boom body self-extends into a linear extended form and becomes stable in the extended form. and retained.

The first elastic deformation element is made of fiber-reinforced resin in which a fiber base material is impregnated with resin,
The fiber base material may be a cross base material in which the orientation direction of the fibers is diagonally crossed in opposite directions to the stretching direction.
The second elastic deformation element is composed of a fiber-reinforced resin obtained by impregnating a fiber base material with a resin, and the fiber base material includes a sheet whose fiber orientation direction extends in a direction parallel to the stretching direction, and a sheet whose fiber orientation direction extends in a direction parallel to the stretching direction. An anisotropic base material can be obtained by laminating sheets extending in orthogonal directions.
Carbon fiber can be used as the thread constituting the fiber base material.
In particular, if the yarn constituting the fiber base material is a spread yarn, and the boom body has a laminated structure in which multiple layers of fiber-reinforced resin sheets in which the fiber base material is impregnated with resin are laminated, the number of layers can be changed. This allows you to change the characteristics of the boom body in stages.
Further, as an application example, a thin film solar cell can be attached to at least one of the first elastic deformation element and the second elastic deformation element to be used as a solar cell paddle.
Further, the boom body can also be used as a structural member of a two-dimensional or three-dimensional structure.

According to the present invention, it is possible to realize a folding boom that has a self-extending force and is also bistable and can stably self-retain in two forms, a folded form and an extended form.

FIG. 1 shows an example of a folding boom according to Embodiment 1 of the present invention, in which (A) is a perspective view of an extended form, and (B) is a perspective view of a folded storage form. (A) is a partial perspective view of two cylindrical components of the boom main body in an extended configuration, (B) is an exploded perspective view of the cylindrical component in (A), and (C) is a cylindrical component in a folded configuration. (D) is an exploded perspective view of the cylindrical component of (C). (A) shows a CFRP sheet constituting the first elastic deformation element, (A) is an explanatory diagram of the orientation direction of the fibers of the fiber base material, and (B) is a perspective view showing a plurality of stacked FRP sheets. FIG. 2C is a schematic cross-sectional view of the laminated structure. (A) shows a CFRP sheet constituting the second elastic deformation element, (A) is an explanatory diagram of the orientation direction of the fibers of the fiber base material, and (B) is a perspective view showing a plurality of stacked FRP sheets. FIG. 2C is a schematic cross-sectional view of the laminated structure. FIG. 2 is a diagram showing an example in which the folding boom of the present invention is applied to a membrane spreading structure. 1 is a perspective view showing a solar cell paddle using the folding boom of the present invention, in which (A) is a folded storage state, (B) is an extended state, and (C) is an extended state. A folding boom according to Embodiment 2 of the present invention is shown, in which (A) is a perspective view showing an extended form, (B) is a perspective view showing a folding process, and (C) is a perspective view showing a folding form.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are presented as examples, and the present invention is not limited to these configurations.
[Embodiment 1]
FIG. 1 shows the overall configuration of a folding boom according to Embodiment 1 of the present invention, in which (A) is a perspective view showing an extended form and (B) a perspective view showing a folded form.
That is, the folding boom 1 includes a bistable boom main body 100 that is stably held in two forms: a folded form 100B that is folded in the axial direction, and an extended form 100A that extends in the uniaxial direction. The extended form 100A is a form that extends in a cylindrical shape as shown in FIG. 1(A), and the folded form 100B is a form that extends in a cylindrical shape as shown in FIG. 1(B). It is in a folded form.
The boom body 100 has a plurality of elastic cylindrical components 10 having the same shape and the same size, and when the boom body 100 is in an extended state, a circular end in a direction orthogonal to the central axis N is flexible. The first hinge elements 101 are connected sequentially in one direction.
The cylindrical component 10 further has a semi-cylindrical first elastic deformation element 11 and a second elastic deformation element 12 by a plane including the central axis N of the boom main body 100 when the boom main body 100 is in an extended state. The structure is such that the first elastic deformation element 11 and the second elastic deformation element 12 are separated, and the sides of the first elastic deformation element 11 and the second elastic deformation element 12 are connected to each other via a flexible second hinge element 102.

Next, the first elastic deformation element 11 and the second elastic deformation element 12 will be explained with reference to FIG. 2. 2 (A) and (B) show the first elastic deformation element, (A) shows the first one-curve form, (B) shows the first two-curve form, (C), (D) shows the second elastic deformation element, (C) shows the second one-curve form, and (D) shows the second two-curve form.
The first elastic deformation element 11 is formed by bending a rectangular thin plate sheet in two directions: an extension direction X of the boom body 100 and a direction Y orthogonal to the extension direction. That is, the first first curved surface extends linearly in the stretching direction A first curved form 11A having W11 extends linearly in the direction Y orthogonal to the extension direction, and has an arc shape in the extension direction X so that the side opposite to the second elastic deformation element 12 has a convex surface. It is possible to stably hold two forms: a first two-curved form 11B having a first two-curved surface W12;
In the first curved form 11A, the sheet surface 11s of the thin sheet is curved in a direction orthogonal to the stretching direction, and the side sides 11a and 11b arranged parallel to the stretching direction X maintain straight lines parallel to each other, and The end sides 11c and 11d arranged in the direction Y orthogonal to the direction are curved in an arc shape. The first two-curve form 11B has a configuration in which the sheet surface 11s of the thin sheet is curved in the extension direction, the end sides 11c and 11d maintain straight lines parallel to each other, and the side sides 11a and 11b are curved in an arc shape. It has become. The state in which both the side sides 11a, 11b and the end sides 11c, 11d are curved is dynamically unstable, and is stable in either the first one-curve form 11A or the first two-curve form 11B. is retained.

The second elastic deformation element 12 is also formed by bending a rectangular thin plate sheet in two directions: an extension direction X of the boom body 100 and a direction Y perpendicular to the extension direction. That is, a second first curved surface extends linearly in the stretching direction X, and curves in an arc shape in the direction Y orthogonal to the stretching direction so that the opposite side to the opposing first elastic deformation element 11 is a convex surface. A second curved form 12A having a curve W21 extends linearly in the direction Y orthogonal to the extension direction, and has a concave surface on the side opposite to the opposing first elastic deformation element 11 in the extension direction X. , a second two-curved form 12B having a second two-curved surface W22 that is a reverse curved surface that curves in an arc shape in the opposite direction to the first two-curved surface W12 of the first elastic deformation element 11; It is possible to stably maintain two forms.
In the second first curved form 12A of the second elastic deformation element 12, the sheet surface 12s of the thin sheet is curved in the direction Y orthogonal to the stretching direction, the side sides 12a and 12b maintain straight lines parallel to each other, and The end sides 12c and 12d arranged in the direction Y orthogonal to the direction are curved in an arc shape. second 2
In the curved form 12B, the sheet surface 12s of the thin sheet is curved in the opposite direction to the stretching direction, the end sides 12c and 12d maintain straight lines parallel to each other, and the side sides 12a and 12b are curved in an arc shape in the opposite direction. It is configured to do this. The state in which both the side sides 12a, 12b and the end sides 12c, 12d are curved is dynamically unstable, and is stable in either the second one-curve form 12A or the second two-curve form 12B. is retained.
Adjacent cylindrical components 10, 10 are alternately connected via the first hinge element 101 such that the first elastic deformation element 11 and the second elastic deformation element 12 are arranged in opposite directions. has been done. That is, the end sides 11c, 11d of the first elastic deformation element 11 of one cylindrical component 10 are the end sides 12c, 12c of the second elastic deformation element 12 of the other cylindrical component 10, which are axially opposed to each other. 12d.

As shown in FIG. 3, the first elastic deformation element 11 has a laminated structure in which a plurality of fiber reinforced resin sheets (FRP sheets) 13 are laminated. Each fiber-reinforced resin sheet 13 has the same structure, and has a structure in which a fiber base material 15 is impregnated with a matrix resin 16.
The fiber base material 15 has a biaxial woven structure, and when the stretching direction is the reference axis N1, the first axle 15a and the second axle 15b are oriented at a predetermined angle θ (orientation) in opposite directions to the reference axis N1. The structure is such that it is sloped by a certain angle. The orientation angle is 45°.
In this embodiment, carbon fibers are used for the first axle thread 15a and the second axle thread 15b, and in particular, they are composed of spread fiber yarns made by flattening fiber bundles into a thin, flattened bundle, and form one fiber-reinforced resin sheet 13. The boom body 100 is configured by setting a thin thickness and laminating a plurality of fiber-reinforced resin sheets 13 together. In this example, the fiber-reinforced resin sheet 13 has a 3-ply structure in which three layers are laminated together, but it may also be a two-layer structure, or a four-layer structure or more.
Although regular fiber bundles may be used instead of spread yarns, CFRP made into a thin film using spread yarns provides greater flexibility in structural design and provides a lighter and more flexible structure. In particular, when it is stored and expanded, it is less likely to buckle due to stress relaxation, and has excellent shape restoring force.

As shown in FIG. 4, the second elastic deformation element 12 also has a laminated structure in which a plurality of fiber reinforced resin sheets (FRP sheets) 23 are laminated. Each fiber-reinforced resin sheet 23 has a structure in which a fiber base material 25 is impregnated with a matrix resin 26, but the fiber base material 25 is not a woven fabric but has a structure in which fibers 25a are oriented in one direction. , is different from the first elastic deformation element 11. The fiber base material 25 has a structure in which two fiber-reinforced resin sheets 23 are stacked, one in which the orientation angle of the fibers 25a is 90° with respect to the reference axis N1, and the other in which the orientation angle is 0°. It has become. Instead of two sheets, three fiber base materials with orientation angles of 90°/0°/90° may be stacked, and the orientation angle of the surface layer (cylindrical outer surface side) is 90° in all cases.
The fibers 25a of this fiber base material 25 are also made of carbon fibers, and are composed of spread yarns made by flatly bundling fiber bundles, and the second elastic deformation element 12 is constructed by laminating a plurality of fiber-reinforced resin sheets 23 together. are doing.
Regarding the base fiber, carbon fiber is used in this embodiment, but in addition to carbon fiber, glass fiber, polyester fiber, fluorine fiber, aramid fiber, polypropylene fiber, polyethylene fiber, metal fiber, etc. Available. When used for antennas etc., conductive fibers can also be used.
Further, as the matrix resin, polycarbonate resin, polyester resin such as PET or PBT, engineering plastic such as PEEK or PPS, heat resistant resin such as polyimide resin, etc. can be used.
For the first hinge element 101 and the second hinge element 102, for example, a flexible soft film is used. For example, the first elastic deformation element 11 and the second elastic deformation element 12 may be attached to a film that covers at least one of the inner and outer surfaces of the boom body 100, or the first hinge element 101 and It may be attached only to the periphery of the second hinge element 102. If the gap between the first elastic deformation element 11 and the second elastic deformation element 12 connected by the first hinge element 101 and the second hinge element 102 is too narrow, folding will not be possible, and if it is too wide, it will not be possible to fold the gap. The stiffness tends to be low and should be set within an appropriate range.

Next, the operation of the boom of this embodiment will be explained.
In the folded form, the first elastic deformation element 11 of the cylindrical component 10 is deformed into the first two-curve form 11B, the second elastic deformation element 12 is deformed into the second two-curve form 12B, and each cylindrical The component 10 fits the second two-curved surface W22 of the second elastic deformation element 12 into the first two-curved surface W12 of the first elastic deformation element 11 via the second hinge element 102. Layer them like this. Thereby, the cylindrical component 10 becomes stable in a curved form 10B having a double structure in which the first elastically deformable element 11 and the second elastically deformable element 12 are overlapped flatly.
In this state, the end side of the cylindrical component 10 is straight, the first hinge element 101 is straight, and the adjacent cylindrical component 10 having the curved form 10B is bent at the first hinge element 101. It becomes possible.
In the cylindrical components 10 adjacent to each other, the first elastic deformation element 11 and the second elastic deformation element 12 are located on opposite sides, so the curved surfaces of the cylindrical components 10 in the curved form 10B are alternately arranged. Since it is curved so as to be convex on the opposite side, if it is bent in a zigzag shape via the first hinge element 101, the curved surfaces of the cylindrical component 10 in the curved form 10B overlap each other, and it is stable. will be retained.
The advantage of zigzag folding in this way is that, unlike in the case of roll-up storage, distortion of the hinge element can be offset. Further, there is no need to use a continuous length of bias cloth, and the cloth material can be cut out in the bias (±45°) direction.
In the case of extension, for the tubular component 10 located at the end of the boom body 100 that is stable in the folded configuration, the first elastic deformation element 11 and the second elastic deformation element 12 are If the curved form 11A is shifted to the second single curved form 12A, the cylindrical component 10 becomes a hollow cylindrical form 10A extending in the extension direction, and the first hinge element 101 opens, so that the adjacent cylindrical component 10, each cylindrical component 10 is elastically deformed into a hollow cylindrical shape, and the boom main body 100 automatically shifts to a linear extended form 100A and self-extends. It is then stably held in a self-extending configuration.
As explained above, according to the present embodiment, the first elastically deformable element 11 is a CFRP sheet in which fibers are oriented in two directions at an angle of 45° left and right, and the second elastically deformable element 12 is oriented in one direction (0 By using an anisotropic CFRP sheet with fibers oriented at angles of 90° and 90°, both the stretched and folded forms are stable and bistable.

Application Example FIG. 5 shows an example in which the folding boom of the present invention is used as a structure for expanding a flexible membrane.
In the illustrated example, one ends of two boom bodies 100 are fixed to two mutually perpendicular side surfaces of a rectangular prism-shaped mounting member 120, and the boom bodies 100 are arranged so as to extend from the mounting member 120 in a V-shape. The hypotenuse of a triangular membrane 130 is attached along the second hinge element 102 of the shaped component 10.
In this way, the membrane 130 can be folded in a zigzag shape along the folded shape of the boom body 100, and by extending the boom body 100, the membrane 130 can be expanded two-dimensionally.
Note that the folding boom of the present invention is not limited to such a two-dimensional structure, and can be used as a structure of a three-dimensional structure.

FIG. 6 shows an example of using the folding boom of the present invention as a solar array paddle. FIG. 6(A) shows the folded state, (B) shows the state in the middle of extension, and (C) shows the extended state.
That is, as shown in FIG. 6C, the boom main body 100 in the extended state is not cylindrical but has a cylindrical shape with a convex lens-like cross section or a spindle-like cross section.
An example is shown in which a thin film solar battery cell 210 is attached to at least one of the first elastic deformation element 11 and the second elastic deformation element 12 of each cylindrical component 10 and used as a solar battery paddle. . In this way, the light receiving efficiency can be increased by reducing the curvature of the first elastically deformable element 11 and the second elastically deformable element 12, which have a convex lens cross section.

[Embodiment 2]
Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the boom main body 200 has an open cross-sectional configuration instead of a closed cross-sectional configuration. In the following description, only the points that differ from the above embodiment will be mainly described, and the same components will be denoted by the same reference numerals and the description thereof will be omitted.
That is, the boom main body 200 is configured to be stably held in two forms: a folded form 200B and an extended form 200A extending in a uniaxial direction.
The boom body 200 has a configuration in which the first elastic deformation elements 11 and the second elastic deformation elements 12 are alternately connected in one direction via a flexible first hinge element 101 in the extended state. It becomes.
The first elastic deformation element 11 is a rectangular elastic thin plate, and has a first curved surface W11 that extends linearly in the extension direction and curves into an arc in the direction orthogonal to the extension direction. The first one-curved form 11A extends linearly in the direction orthogonal to the extension direction, and has an arc shape in the extension direction so that the curved surface is convex in the same direction as the first one-curved surface W11. It is possible to stably hold two forms, the first two-curved form 11B having the first two-curved surface W12.
The second elastic deformation element 12 is also a rectangular elastic thin plate, which extends linearly in the direction of extension and curves in an arc in the direction perpendicular to the direction of extension. A second one-curved form 12A having a second one-curved surface W21 having the same shape as the one-curved surface W11 of the first one; A second curved surface W22 having a second curved surface W22 curved in an arc so as to be convex in the opposite direction to the second curved surface W21 with respect to a surface passing through the sides 12a, 12b of the curved shape 12A. It is possible to stably hold two curved forms 12B and 12B.
In the extended configuration, the first elastic deformation element 11 and the second elastic deformation element 12 are configured so that the opposite arcuate ends of the first one-curve configuration 11A are connected to each other via the first hinge element 101, and the first elastic deformation element 11 and the second elastic deformation element 12 are folded. In this case, the second two curved surfaces W22 of the second elastic deformation element 12 are curved convexly in the opposite direction to the first two curved surfaces W12 of the first elastic deformation element 11. .

Next, the operation of the boom of this embodiment will be explained.
In the folded form 200B, the boom body 200 has a first two-curved surface W12 of the first two-curved form of the adjacent first elastically deformable element 11 and a second two-curved form of the second elastically deformable element 12. By inverting the second two curved surfaces W22 of 12B in a zigzag shape via the first hinge element 101, a second elastic deformation element is formed on the first two curved surfaces W12 of the first elastic deformation element 11. The twelve second two curved surfaces W22 overlap and are stably held.
In the case of extending, the first elastic deformation element 11 or the second elastic deformation element 12 located at the end of the boom body 200, which is stable in the folded form, is changed to the first first curved form 11A and the second elastic deformable element 12, respectively. If the first elastic deformation element 11 or the second elastic deformation element 12 is shifted to the first curved form 12A, the first elastic deformation element 11 or the second elastic deformation element 12 becomes a semi-cylindrical shape with an arcuate cross section extending in the extension direction, and the first hinge element 101 opens, so that the adjacent The deformation is successively propagated to the first elastic deformation element 11 or the second elastic deformation element 12, and the first elastic deformation element 11 and the second elastic deformation element 12 of each constituent unit are stretched in the stretching direction. The boom body 200 is elastically deformed into a first one-curved form 11A and a second one-curved form 12A in an extending semi-cylindrical shape, and the boom body 200 self-extends into a linear extended form 200A, and is stably held in the extended form.
In this way, according to the second embodiment, the first elastically deformable element 11 is made of a CFRP sheet with fibers oriented in two directions at an angle of 45° left and right, and the second elastically deformable element 12 is made of a CFRP sheet with fibers oriented in two directions (0°, 0°, By using an anisotropic CFRP sheet with fibers oriented at an angle of 90°, it is stable in both the stretched and folded forms and can provide bistable properties.
Note that the folding boom of the second embodiment can also be used as the membrane extension structure shown in FIG. 5 and the solar cell paddle shown in FIG. 6.
Further, the extension structure of the present invention is not limited to the embodiments described above, and it goes without saying that various changes can be made within the scope of the invention.

1 folding boom 10 tubular component;
10A Cylindrical form, 10B Curved form 11 First elastic deformation element 11A First 1-curved form, 11B 1st 2-curved form 12 2nd elastic deformable element 12A 2nd 1-curved form, 12B 2nd 2-curved form Form 13 Fiber reinforced resin sheet, 15 Fiber base material, 16 Matrix resin 23 Fiber reinforced resin sheet, 25 Fiber base material, 26 Matrix resin 100 Boom body 100A Extended form, 100B Folded form 101 First hinge element 102 Second hinge Element N Central axis W11 First one-curved surface, W12 First two-curved surface W21 Second one-curved surface, W22 Second two-curved surface X Stretching direction Y Direction orthogonal to the stretching direction θ Orientation angle

Claims (6)

A folding boom having a bistable boom body that is stably held in two forms: a folded form and an extended form that extends in a uniaxial direction,
The boom body includes a plurality of units of elastic cylindrical components connected in one direction via a first hinge element,
Each cylindrical component is divided into a first elastic deformation element and a second elastic deformation element by a plane including the central axis of the boom main body in an extended state, and the first elastic deformation element and the second elastic deformation element A configuration in which the elastic deformation element is connected via a flexible second hinge element,
The first elastic deformation element is a rectangular elastic thin plate that extends linearly in the direction of extension, and has a convex surface on the opposite side from the second elastic deformation element in the direction perpendicular to the direction of extension. A first curved form that curves in an arc shape, and extends linearly in a direction orthogonal to the extension direction, and curves in an arc shape in the extension direction so that the side opposite to the second elastic deformation element has a convex surface. It is possible to stably hold the first two curved forms and the two forms;
The second elastic deformation element is a rectangular elastic thin plate that extends linearly in the extension direction, and has an arcuate shape in the direction orthogonal to the extension direction so that the opposite side to the first elastic deformation element has a convex surface. a second curved form that is curved in a straight line; It is possible to stably hold two forms: a second two curved forms that curve in the opposite direction to the elastic deformation element;
A folding boom characterized in that adjacent cylindrical components are arranged such that the first elastic deformation element and the second elastic deformation element are oppositely arranged. A folding boom having a bistable boom body that is stably held in two forms: a folded form and an extended form that extends in a uniaxial direction,
The boom body has a configuration in which first elastic deformation elements and second elastic deformation elements are alternately connected in one direction via a flexible first hinge element,
The first elastic deformation element is a rectangular elastic thin plate, and has a first curved form that extends linearly in the extension direction and curves in an arc shape in a direction orthogonal to the extension direction; and a first two-curved form that extends linearly in the direction orthogonal to the curved line and curves in an arc shape in the extension direction so that the same side as the curved surface of the first one-curved form is convex. It can be held stably,
The second elastic deformation element is a rectangular elastic thin plate, and has a second first curved form that extends linearly in the extension direction and curves in an arc shape in a direction perpendicular to the extension direction; It is possible to stably maintain two forms: a second two-curved form that extends linearly in the orthogonal direction and is curved in the opposite direction to the second first curved form in the extension direction. A folding boom that is characterized by: The first elastic deformation element is made of a fiber-reinforced resin obtained by impregnating a fiber base material with a resin, and the fiber base material has fiber orientation directions diagonally crossing each other in opposite directions to the stretching direction. The folding boom according to claim 1 or 2, which is a cloth base material. The second elastic deformation element is made of a fiber-reinforced resin obtained by impregnating a fiber base material with a resin, and the fiber base material includes a sheet whose fiber orientation direction extends in a direction parallel to the stretching direction, and a sheet whose fiber orientation direction extends in a direction parallel to the stretching direction. The folding boom according to any one of claims 1 to 3, which is an anisotropic base material made of laminated sheets extending in a direction perpendicular to the base material. The folding device according to any one of claims 1 to 4, wherein a thin film solar cell is attached to at least one of the first elastic deformation element and the second elastic deformation element to be used as a solar cell paddle. boom. The folding boom according to any one of claims 1 to 4, which is used as a structural member of a two-dimensional or three-dimensional structure.

Images